Add mismatched image test

Author: forsyth2

tests/images/CRU-TREFHT-ANN-land_60S90N_input_actual.png

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+import os
+from typing import List, Optional
+
+from mache import MachineInfo
+
+from tests.integration.image_checker import _compare_actual_and_expected
+
+
+# Run this test with:
+# cd zppy
+# pytest tests/images/test_image_checker.py
+def test_compare():
+    missing_images: List[str] = []
+    mismatched_images: List[str] = []
+
+    directory: str = "tests/images/"
+    # Copied from /lcrc/group/e3sm/public_html/diagnostic_output/ac.forsyth2/zppy_weekly_comprehensive_v3_www/test_zppy_20250401/v3.LR.historical_0051/image_check_failures_comprehensive_v3/e3sm_diags/atm_monthly_180x360_aave/model_vs_obs_1987-1988/lat_lon/CRU_IPCC/CRU-TREFHT-ANN-land_60S90N.png_*
+    image_name: str = "CRU-TREFHT-ANN-land_60S90N"
+    path_to_actual_png: str = f"{directory}CRU-TREFHT-ANN-land_60S90N_input_actual.png"
+    path_to_expected_png: str = (
+        f"{directory}CRU-TREFHT-ANN-land_60S90N_input_expected.png"
+    )
+
+    machine_info = MachineInfo()
+    web_portal_base_path: str = machine_info.config.get("web_portal", "base_path")
+    web_portal_base_url: str = machine_info.config.get("web_portal", "base_url")
+    print(f"web_portal_base_path: {web_portal_base_path}")
+    print(f"web_portal_base_url: {web_portal_base_url}")
+    user: Optional[str] = os.environ.get("USER")
+    if not user:
+        raise RuntimeError("USER could not be determined.")
+    # Example diff dir URL: https://web.lcrc.anl.gov/public/e3sm/diagnostic_output/ac.forsyth2/test_image_checker_diffs/
+    diff_dir: str = f"{web_portal_base_path}/{user}/test_image_checker_diffs"
+
+    _compare_actual_and_expected(
+        missing_images,
+        mismatched_images,
+        image_name,
+        path_to_actual_png,
+        path_to_expected_png,
+        diff_dir,
+    )
+    assert missing_images == []
+    assert mismatched_images == ["CRU-TREFHT-ANN-land_60S90N"]